Answer:
In animal field studies, why do scientists usually try to work without making the animals aware that the humans are present? It is necessary to observe the animals without disturbing them. When a controlled experiment is not possible, why do scientists try to identify as many relevant variables as possible?
Answer:
D
Explanation:
Bones provide calcium that is essential for the proper functioning of the nervous system.
The answer is Archegonia and Antheridia. Female gametangia are called Archegonia while male gametangia are called Antheridia.
The statement is false. Squash and tomatoes are not vegetables, thus they considered as fruits.
Answer:
Autotrophs (self-feeders) are organisms that use an external energy source to assimilate inorganic resources from the environment and synthesize the biological molecules needed to sustain life. The ultimate source of this energy is the nuclear fusion of hydrogen in the Sun.
Explanation:
A physical attribute of an organism, such as hair color, height, color pattern, etc. or is may be a trait
